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A kind of method of electroflocculation to remove chromaticity of anodic oxidation dyeing wastewater

A dyeing wastewater and anodic oxidation technology, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as difficult decolorization, incomplete treatment of anodic dyeing wastewater, and secondary pollution. Achieve the effects of improving treatment efficiency, preventing dirt coverage, and delaying passivation

Active Publication Date: 2021-10-08
DONGGUAN SANRENXING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these current methods are not thorough in the treatment of anode dyeing wastewater, it is difficult to completely decolorize, and secondary pollution is likely to occur during the treatment process

Method used

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  • A kind of method of electroflocculation to remove chromaticity of anodic oxidation dyeing wastewater
  • A kind of method of electroflocculation to remove chromaticity of anodic oxidation dyeing wastewater
  • A kind of method of electroflocculation to remove chromaticity of anodic oxidation dyeing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for removing the chroma of anodic oxidation dyeing wastewater by electrocoagulation, comprising the steps of:

[0029] 1) Pump the anodic oxidation dyeing wastewater into the pH adjustment tank, and adjust the pH value of the wastewater to 2 with sulfuric acid;

[0030] 2) Then, the wastewater regulated by sulfuric acid is pumped into the electrocoagulation device for electrocoagulation and electrooxidation reactions. After the reaction is completed, an alkali regulator is added to adjust the pH value of the wastewater after electrolysis to 7;

[0031] 3) Pump the wastewater oxidized by the electrocoagulation device into the sedimentation tank, add flocculant polyacrylic acid for coagulation and sedimentation treatment, and finally discharge the standard wastewater after passing through the filter equipment.

[0032] The electrocoagulation device includes a DC power supply, an electrolytic cell, an anode brush, a through-hole plate, an anode plate, a negative p...

Embodiment 2

[0035] A method for removing the chroma of anodic oxidation dyeing wastewater by electrocoagulation, comprising the steps of:

[0036] 1) Pump the anodic oxidation dyeing wastewater into the pH adjustment tank, and adjust the pH value of the wastewater to 2.5 with hydrochloric acid;

[0037] 2) Then, the wastewater regulated by sulfuric acid is pumped into the electrocoagulation device for electrocoagulation and electrooxidation reactions. After the reaction is completed, an alkali regulator is added to adjust the pH value of the wastewater after electrolysis to 7.5;

[0038]3) Pump the wastewater oxidized by the electrocoagulation device into the sedimentation tank, add flocculant calcium polyacrylate for coagulation and sedimentation treatment, and finally discharge the standard wastewater after passing through the filter equipment.

[0039] The electrocoagulation device includes a DC power supply, an electrolytic cell, an anode brush, a through-hole plate, an anode plate, a...

Embodiment 3

[0042] A method for removing the chroma of anodic oxidation dyeing wastewater by electrocoagulation, comprising the steps of:

[0043] 1) Pump the anodic oxidation dyeing wastewater into the pH value adjustment pool, and adjust the pH value of the wastewater to 3 with a mixture of sulfuric acid and hydrochloric acid at a ratio of 1:1 by weight;

[0044] 2) Then, the wastewater regulated by sulfuric acid is pumped into the electrocoagulation device for electrocoagulation and electrooxidation reactions. After the reaction is completed, an alkali regulator is added to adjust the pH value of the wastewater after electrolysis to 8;

[0045] 3) Pump the wastewater oxidized by the electrocoagulation device into the sedimentation tank, add flocculant sodium polyacrylate for coagulation and sedimentation treatment, and finally discharge the standard wastewater after passing through the filter equipment.

[0046] The electrocoagulation device includes a DC power supply, an electrolytic ...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a method for removing the chroma of anodic oxidation dyeing wastewater by electrocoagulation, the method comprising the following steps: 1) pumping the dyeing wastewater into a pH adjustment pool to adjust the pH value to 2-4; ) pump the adjusted wastewater into the electrocoagulation device for electrocoagulation and electrooxidation; 3) pump the electrooxidized wastewater into the sedimentation tank, add alkali to adjust the pH value to 7-9, and then add flocculant for treatment. The invention is based on a self-designed reactor, and can effectively improve the treatment efficiency of dyed sewage by setting a three-step treatment mechanism, wherein the hydroxyl radicals generated in the electroflocculation device oxidize and decompose the metal complexes, and then generate The polynuclear hydroxyl complex flocculates and precipitates metal ions, and aeration can increase the degree of diffusion of flocs, delay anode passivation, improve the color removal effect of dyeing wastewater, and ensure that the chroma of the effluent is within 5 times.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for removing the chroma of anodic oxidation dyeing wastewater by electrocoagulation. Background technique [0002] As a common and main technology in surface treatment of electroplating industry, anodizing technology is widely used in electroplating industry. Usually, metal components need to be degreased by acid and alkali before the anodizing process, or dyeing treatment is required to improve the surface hardness and wear resistance of the metal, and a large amount of dyeing will be produced in a series of dyeing processes waste water. After anodizing, it is necessary to perform surface sealing treatment on the plated metal components. At present, most electroplating enterprises use nickel acetate as the sealing agent. During this process, enterprises will produce a large amount of degreasing wastewater, acid-base wastewater, and nickel-containing waste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/463
CPCC02F1/463
Inventor 焦伟丽
Owner DONGGUAN SANRENXING ENVIRONMENTAL TECH CO LTD
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